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Slopes are subjected to stress redistributions during underground mining activities, and

Posted on August 23, 2017 at 1:07 am.

Slopes are subjected to stress redistributions during underground mining activities, and this may eventually cause deformation or landslide. the parallel relationship tightness percentage ( =? -?0.27ln(=?0.12ln(is the elastic contact modulus of particles, is the normal tightness and is the tangential tightness. Zhou et al. (2012) investigated the effect of micro-properties within the friction angle (=?73.76 +?19.51ln(=?24.56 -?0.21 (is the normal relationship strength, is the shear relationship strength, is the coefficient of friction between particles. The parametric simulation used initial input properties derived from the Eqs.?2C5. The modeled particle sizes ranged between 0.3 and 1.5?mm. Modenese (2013) highlighted the importance of selecting a representative elementary volume for any DEM model in which the number of grains is definitely adequate to remove any adverse impact on the numerical results. Prior to simulations of the actual slope, a sensitivity analysis was performed to study the effect of model size percentage on the result of simulation based on the triaxial specimen size. The specimen width to particle diameter ratio (1 time step?=?1?s Fig.?13 VelocityCtime relationships inside a X-direction, b Y-direction. Notice: 1 time step?=?1?s The sliding mass offers experienced different run-out behaviours during the four prescribed phases of mass movement. During the acceleration stage which occurred within the 1st 100,000 time steps, the maximum buy 13476-25-0 velocity has reached 2.5?m/s. The mass deformed rapidly via a shearing along the sliding aircraft (Fig.?14a). The sliding mass was then deposited on a relatively gentle feet and experienced a relatively slow movement (Fig.?14b). The collision between sliding mass resulted in fragmented particles and eventually created a debris circulation. The debris circulation was consequently travelled into a thin and steep channel which re-accelerated the mass to travel at a high velocity (Fig.?14c). The wide and mild topography coupled with the bending nature of the channel near the wall plug caused the debris circulation to decelerate and eventually deposited within the channel wall plug (Fig.?14d). The longest run-out range from the analysis was 260?m, which was consistent with the specific field observation (Figs.?6 and ?and1515). Fig.?14 Phases of simulated landslide propagation: a sliding, b deceleration at toe, c re-acceleration when debris entering the narrow channel, d deposition in the channel outlet Fig.?15 Picture of deposition in the channel outlet The Madaling slope was not instrumented before and during the landslide occurrence. Consequently, direct validations of the simulated run-out behaviours become practically impossible. buy 13476-25-0 These limitations possess restricted the possibility of carrying out quantitative comparisons between the numerical simulation results and the field data. Nonetheless, the computations of important quantities such as run-out velocity and range, as well as thickness of deposition can still be verified from your post-failure field investigation. These indirect validations/comparisons could increase the level of confidence towards validity of the simulated results. Crosta et al. (2003) reported that in situ evidences like major pressure buy 13476-25-0 or shear splits, post-event descriptions of the main failure surface and depositions could be useful qualitative evidences to validate the simulation results. Numerous researchers used laboratory scaled granular circulation experiments or down-scaled slope models to validate the specific run-out behaviours of landslides (Major 1997; Lajeunesse et al. 2006; DAgostino et al. 2010). These laboratory experiments can be performed in future studies to improve the insightfulness of the investigation. Summary This paper presents the results of numerical analyses to provide insights buy 13476-25-0 into the failure mechanism and failure propagation of the Madaling landslide 2006. The findings of the present study provide useful quantitative evidences for validating the failure mechanism reported by Wang et al. (2013). Even though the present study generally agreed with the mechanical mechanism reported from Plxdc1 the previous study, this study still contributed to several fresh findings, such as information about the material properties at the time of failure, predicted characteristics of tension splits developed on site, and floor arrangement as the result of the mining activities etc..